The
Jokermobile is big-fun! It's perfectly perfect that the Seventies
version of the Jokermobile is a converted VW Microbus!The Boxing glove
trap-door is really neat! And the rooftop daisy that you can actually
fill with liquid and squirt is an inspired, and inexpensive design
bonus! Just don't soak your mint condition Batman with it! Those damn
stickers have enough trouble sticking to the fabric as it is!

There is something so uniquely satisfying about seeing the Riddler
driving the Joker Mobile. It seems linked to the way kids played.

Interview
with DC Editor Sol Harrison that explains the origins of the Joker
Mobile (and the Wayne Foundation)